<html>
<head>
	<meta charset="UTF-8">
	<meta content="IE=edge" http-equiv="X-UA-Compatible">
	<meta content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no, width=device-width" name="viewport">
	<title>2788：[Poi2012]Festival</title>
	<!-- css -->
	<link href="../css/base.min.css" rel="stylesheet">
	<link href="../css/project.min.css" rel="stylesheet">
	
	<!-- favicon -->
	<!-- ... -->
</head>
<body class="page-brand">
	<header class="header header-transparent header-waterfall ui-header">
		<ul class="nav nav-list pull-left">
			<li>
				<a data-toggle="menu" href="#menu">
					<span class="icon icon-lg">menu</span>
				</a>
			</li>
		</ul>
		<a class="header-logo header-affix-hide margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Poi2012]Festival</a>
		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Poi2012]Festival</span>
	</header>
	<nav aria-hidden="true" class="menu" id="menu" tabindex="-1">
		<div class="menu-scroll">
			<div class="menu-content">
				<a class="menu-logo" href="../index.html">BZOJ离线题库</a>
				<ul class="nav">
					<li>
						<a class="waves-attach" data-toggle="collapse" href="#problems">题目</a>
						<ul class="menu-collapse collapse in" id="problems">
							<li>
								<a class="waves-attach" href="../index.html">主页</a>
							</li>
							<li>
								<a class="waves-attach" href="../list.html">题目列表</a>
							</li>
						</ul>
					</li>
					<li>
						<a class="collapsed waves-attach" data-toggle="collapse" href="#about">关于</a>
						<ul class="menu-collapse collapse" id="about">
							<li>
								<a class="waves-attach" href="../about.html">关于此项目</a>
							</li>
						</ul>
					</li>
					
				</ul>
			</div>
		</div>
	</nav>
	<main class="content">
		<div class="content-header ui-content-header">
			<div class="container">
				<h1 class="content-heading">
                [Poi2012]Festival                </h1>
                <p>时间限制：30s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
		</div>
		<div class="container">
			<section class="content-inner margin-top-no">
				<div class="row">
					<div class="col-lg-13 col-md-13">
						<div class="card margin-bottom-no">
							<div class="card-main">
								<div class="card-inner">
									
                                <h3>题目描述</h3><p><p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;"><br />
</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;">有n个正整数X1,X2,...,Xn，再给出m1+m2个限制条件，限制分为两类：</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;">1. 给出a,b (1&lt;=a,b&lt;=n)，要求满足Xa + 1 = Xb</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;">2. 给出c,d (1&lt;=c,d&lt;=n)，要求满足Xc &lt;= Xd</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;">在满足所有限制的条件下，求集合{Xi}大小的最大值。</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;"><br />
</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;"><br />
</span></font></p>
<p></p></p><hr/><h3>输入格式</h3><p><p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px; "><br class="Apple-interchange-newline" />
第一行三个正整数n, m1, m2 (2&lt;=n&lt;=600, 1&lt;=m1+m2&lt;=100,000)。</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px; ">接下来m1行每行两个正整数a,b (1&lt;=a,b&lt;=n)，表示第一类限制。</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px; ">接下来m2行每行两个正整数c,d (1&lt;=c,d&lt;=n)，表示第二类限制。</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px; "><br />
</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px;"><br />
</span></font></p>
<p class="MsoNormal" align="left" style="margin: 0cm 0cm 0pt; line-height: 140%; text-align: left; mso-pagination: widow-orphan; mso-margin-top-alt: auto; mso-margin-bottom-alt: auto"><span style="font-size: medium"><span lang="EN-US"><o:p></o:p></span></span><span lang="EN-US"><o:p></o:p></span></p></p><hr/><h3>输出格式</h3><p><p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><span style="color: rgb(68, 68, 68); font-family: Tahoma; font-size: medium; line-height: 22px; ">一个正整数，表示集合{Xi}大小的最大值。</span></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px; "><br />
</span></font></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; ">如果无解输出NIE。</p>
<p class="MsoNormal" align="left" style="margin: 0cm 0cm 0pt; line-height: 140%; text-align: left; mso-pagination: widow-orphan; tab-stops: 45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt"><span style="font-size: medium"><span lang="EN-US"><o:p></o:p></span></span><span lang="EN-US"><o:p></o:p></span></p></p><hr/><h3>样例输入</h3><pre>4 2 2

1 2

3 4

1 4

3 1

</pre><hr/><h3>样例输出</h3><pre>3
</pre><hr/><h3>提示</h3><p><p><span style="line-height: 22px; color: rgb(68, 68, 68); font-family: Tahoma; font-size: medium; text-align: left; ">|X3=1, X1=X4=2, X2=3</span></p>
<p class="MsoNormal" align="left" style="margin-top: 0cm; margin-right: 0cm; margin-bottom: 0pt; margin-left: 0cm; text-align: left; "><font color="#444444" face="Tahoma" size="3"><span style="line-height: 22px; ">这样答案为3。容易发现没有更大的方案。</span></font></p>
<p></p>
<p></p></p><hr/><h3>题目来源</h3><p>鸣谢 oimaster</p>
								</div>
							</div>
						</div>
					</div>
				</div>
				
				
			</section>
		</div>
	</main>

	<div class="fbtn-container">
		<div class="fbtn-inner">
			<a class="fbtn fbtn-lg fbtn-brand-accent waves-attach waves-circle waves-light waves-effect" data-toggle="dropdown" aria-expanded="true"><span class="fbtn-text fbtn-text-left">Menu</span><span class="fbtn-ori icon">apps</span><span class="fbtn-sub icon">close</span></a>
			<div class="fbtn-dropup">
				<a class="fbtn fbtn-brand waves-attach waves-circle waves-light waves-effect" href="../list.html" target="_self"><span class="fbtn-text fbtn-text-left">题目列表</span><span class="icon">menu</span></a>
				<a class="fbtn fbtn-green waves-attach waves-circle waves-effect" href="../index.html" target="_self"><span class="fbtn-text fbtn-text-left">返回主页</span><span class="icon">home</span></a>
				<a class="fbtn waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/submitpage.php?id=2788" target="_blank"><span class="fbtn-text fbtn-text-left">提交代码</span><span class="icon">send</span></a>
				<a class="fbtn fbtn-orange waves-attach waves-circle waves-effect" href="http://www.lydsy.com/JudgeOnline/wttl/wttl.php?pid=2788" target="_blank"><span class="fbtn-text fbtn-text-left">试题讨论</span><span class="icon">chat</span></a>
				
			</div>
		</div>
	</div>

	<!-- js -->
	<script src="../js/jquery.min.js"></script>
	<script src="../js/base.min.js"></script>
	<script src="../js/project.min.js"></script>
</body>
</html>